Results 11 to 20 of about 136,660 (228)
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT In this work, we aim to calibrate an interferential seeing monitor (ISM), which is a testing instument used at astronomical sites. Its method is based on the study of the diffraction pattern produced by a Young’s double-slit at the focus plane of a telescope.
Mohammed Sabil, A Habib, Z Benkhaldoun
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Wave propagation effect on differential image motion monitor measurements
Monthly Notices of the Royal Astronomical Society, 2019 ABSTRACT The differential image motion monitor (DIMM) is widely used to measure the atmospheric optical turbulence (OT) integral over the line of sight. However, it is known that because of the wave propagation effect, the DIMM’s sensitivity falls with the distance to the turbulent layer and the variance of differential image motion is ...
Victor Kornilov, Boris Safonov
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Differential image motion in the short exposure regime
Monthly Notices of the Royal Astronomical Society, 2011 Whole atmosphere seeing \beta_0 is the most important parameter in site testing measurements. Estimation of the seeing from a variance of differential image motion is always biased by a non-zero DIMM exposure, which results in a wind smoothing.
B. Safonov +19 more
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Seeing measurements using the solar limb - I. Comparison of evaluation methods for the Differential Image Motion Monitor [PDF]
Monthly Notices of the Royal Astronomical Society, 2011 T. Kawate +3 more
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Combined MASS-DIMM instrument for atmospheric turbulence studies [PDF]
, 2007 Several site-testing programs and observatories currently use combined MASS-DIMM instruments for monitoring parameters of optical turbulence. The instrument is described here.
A. Tokovinin +27 more
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Results from the GMT Ground-Layer Experiment at the Magellan Telescopes [PDF]
, 2006 We present results from our two year study of ground-layer turbulence as seen through the 6.5-meter Magellan Telescopes at Las Campanas Observatory. The experiment consists of multiple, moderate resolution, Shack-Hartmann wavefront sensors deployed over ...
Athey, A. +3 more
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Observing Geohazards from Space
Geosciences, 2018 With a wide spectrum of imaging capabilities—from optical to radar sensors, low to very high resolution, continental to local scale, single-image to multi-temporal approaches, yearly to sub-daily acquisition repeat cycles—Earth Observation (EO) offers ...
Francesca Cigna
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Excellent daytime seeing at Dome Fuji on the Antarctic plateau [PDF]
, 2013 Context. Dome Fuji, the second highest region on the Antarctic plateau, is expected to have some of the best astronomical seeing on Earth. However, site testing at Dome Fuji is still in its very early stages. Aims.
H. Motoyama +4 more
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Glacier motion estimation using SAR offset-tracking procedures [PDF]
, 2002 Two image-to-image patch offset techniques for estimating feature motion between satellite synthetic aperture radar (SAR) images are discussed. Intensity tracking, based on patch intensity cross-correlation optimization, and coherence tracking, based on
Luckman, A. +4 more
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The Sunyaev-Zel'dovich Infrared Experiment: A Millimeter-wave Receiver for Cluster Cosmology [PDF]
, 1997 Measurements of the Sunyaev-Zel'dovich (S-Z) effect towards distant clusters of galaxies can be used to determine the Hubble constant and the radial component of cluster peculiar velocities.
A. E. Lange +18 more
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